Of course do altcoins offer cheaper transaction fees, because their networks don't experience any sort of actual usage. None of the altcoins in this market comes even close to how robust and secure Bitcoin's network is, and that premium will cost you, it's that simple. I must however admit that at this point the fees aren't reasonable anymore, but that's something Lightning Network will take care of, so there is no need for merchants to accept whatever altcoin. This ecosystem need to start with seriously utilizing Segwit, which is something that will lower the fees a notch or two, and that's the main point everyone aims at, right? In other words, blame all the services still not having upgraded their operations.